推导出这样结论的另一种方法是：效用是没有单位的，但至少我们可以在脑子衡量我们的愉悦程度。

Another way to put this is that there are no natural units for utility, at least until such time as we are able to measure pleasure in the brain.

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最好的办法，同时也是很重要的守则就是忘我嘴，不要吝啬让你的手和嘴，让它们最大程度地发挥效用。

The best way to approach this situation, and an important threesome rule to follow, is to forget your feelings for a moment and try to be as generous with your hands and mouth as you can.

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如果导游人员整体的服务质量都高，那么对游客的效用也大，游客的满意程度就高。

If the quality of overall tour guides is high, the tour guide service will prove more effective and tourists will be more satisfied.

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